Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first image in a sequence for a displayscreen or portion thereof with an animated graphical user interfaceshowing our new design; and,

FIG. 2 is a front view of a second image thereof.

The broken lines shown in the figures represent portions of the displayscreen or portion thereof with an animated graphical user interface thatform no part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-2. The process or period in whichone image transitions to another forms no part of the claimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with an animated graphical user interface, as shown anddescribed.